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The monthly earnings of a group of business students are normally distributed with a standard deviation of $594. A researcher wishes to estimate the mean monthly earnings of business students. Find the sample size needed to have a confidence level of 90 percent with a margin of error of $137.
The expecyed monetary value with no survey is $62,000. If the expected value of sample information is -$7,000, what is the expected monetary value with the survey?
under appropriate conditions the sampling distribution of the z-statistic is approximately a standard normal
In our example of research on lipstick, where E = $2 and S = $29, what sample size would we require if we desired a 99 percent confidence level? What about if we keep the 95 percent confidence level, but decide that our acceptable error is $4?
In a standard normal dist. what is the prob. of getting a value less than 1.63? How about between 1.13 and 1.86? How about greater than .58?
suppose a researcher was investigating how much time students spend studying each week. she randomly selected 100
The manager of the Gander Mountain store in Frogtown, IL, believes that his prices for ammunition are lower than the prices of his primary competitor in the hunting equipment market, Cabela's.
the manager of a video library would like the variance of the waiting times of the customers not to exceed 2.30
The fill volume of cans produced by a certain machine is normally distributed with mean 12 oz and standard deviation .03 oz. [4] a. What proportion of cans contain less than 12 oz?
Both days have sample standard deviations of 3.4. Is the average mean of size different from day 1 to day 2?
the makers of compute-all know that in the past 40 of their sales were from people under 30 years old 45 of their sales
studies indicate that the price elasticity of demand for potato chips is about 1.0 if a bag of potato chips currently
the bailey agency is studying long distance calls made from there office. they find that the length of calls follows a
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